diff --git a/lib/libflint b/lib/libflint
index 1cf3ae7..8660853 160000
--- a/lib/libflint
+++ b/lib/libflint
@@ -1 +1 @@
-Subproject commit 1cf3ae727043a834a3d05bfaed1ea0badb3f282e
+Subproject commit 8660853f25d4de5e7adf1dd8361c3397914a2e57
diff --git a/src/2015/07.c b/src/2015/07.c
index e3cc840..c1b8735 100644
--- a/src/2015/07.c
+++ b/src/2015/07.c
@@ -1,20 +1,117 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
+#include <stddef.h>
 
+#include "uthash.h"
 #include "lfinput.h"
+#include "lfbool.h"
+
+#ifdef __linux__
+#include <bsd/stdlib.h>
+#else
+#include <stdlib.h>
+#endif
+
+struct Wire {
+    char name[8];
+    uint16_t val;
+    UT_hash_handle hh;
+};
+
+struct Wire *wires = NULL;
+
+static void set_wire(const char *name, int v) {
+    struct Wire *w;
+    HASH_FIND_STR(wires, name, w);
+    if (w == NULL) {
+        w = malloc(sizeof(struct Wire));
+        strcpy(w->name, name);
+        HASH_ADD_STR(wires, name, w);
+    }
+    w->val = v;
+}
+
+static struct Wire *get_wire(const char *name) {
+    struct Wire *w = NULL;
+    HASH_FIND_STR(wires, name, w);
+    return w;
+}
+
+static void clear_wires() {
+    struct Wire *c, *t;
+    HASH_ITER(hh, wires, c, t) {
+        HASH_DEL(wires, c);
+        free(c);
+    }
+}
+
+static uint16_t get_val(const char* n) {
+    const char *errstr;
+
+    uint16_t v = strtonum(n, 0, 1 << 16, &errstr);
+    if (errstr == NULL) {
+        return v;
+    };
+
+    struct Wire *w = get_wire(n);
+    if (w == NULL) {
+        return 0;
+    }
+    return w->val;
+}
 
 void advent2015day07(void) {
     size_t sz = 0;
     char **input = get_lines("input/2015/07", &sz);
-    for (size_t i = 0; i < sz; ++i) {
-        char *buf = malloc(sizeof(char) * 32);
+    size_t i = 0;
+    int a_set = LFFALSE;
+
+    while (!a_set) {
+        char *buf = malloc(sizeof(char) * strlen(input[i]) + 1);
+        strcpy(buf, input[i]);
         size_t sp_sz = 0;
         char **sp = split(buf, &sp_sz, " ");
+        int s = 0;
 
+        if (sp_sz == 3) {
+            uint16_t a = get_val(sp[0]);
+            if (a != 0) {
+                set_wire(sp[2], a);
+            }
+        } else if (sp_sz == 4) {
+            uint16_t a = get_val(sp[0]);
+            if (a != 0) {
+                set_wire(sp[2], ~a);
+            }
+        } else {
+            uint16_t a = get_val(sp[0]);
+            uint16_t b = get_val(sp[2]);
+            if (a != 0 && b != 0) {
+                if (strcmp(sp[1], "AND") == 0) {
+                    set_wire(sp[4], a & b);
+                } else if (strcmp(sp[1], "OR") == 0) {
+                    set_wire(sp[4], a | b);
+                } else if (strcmp(sp[1], "LSHIFT") == 0) {
+                    set_wire(sp[4], a << b);
+                } else if (strcmp(sp[1], "RSHIFT") == 0) {
+                    set_wire(sp[4], a >> b);
+                }
+            }
+        }
 
+        uint16_t a = get_val("a");
+        if (a != 0) {
+            a_set = LFTRUE;
+        }
 
         del_split(sp);
+        ++i;
+        if (i == sz) {
+            i = 0;
+        }
     }
 
+    printf("%u\n", get_wire("a")->val);
     del_lines(input);
 }
diff --git a/src/main.c b/src/main.c
index a492aaf..4420642 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,11 +1,10 @@
 #include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
 
 #ifdef __linux__
-
 #include <bsd/stdlib.h>
-
+#else
+#include <stdlib.h>
 #endif
 
 #include "advent2015.h"